JavaGroups
Class List

java.lang.Object
  |
  +--JavaGroups.List

Direct Known Subclasses:

SortedList, Stack

public class List

extends java.lang.Object

implements java.io.Externalizable

Doubly-linked list. Elements can be added at head or tail and removed from head/tail. This class is tuned for element access at either head or tail, random access to elements is not very fast; in this case use Vector. Concurrent access is supported: a thread is blocked while another thread adds/removes an object. When no objects are available, removal returns null.

See Also:

Serialized Form

Constructor Summary

List()

Method Summary

void	Add(java.lang.Object obj) Adds an object at the tail of the list.
void	AddAtHead(java.lang.Object obj) Adds an object at the head of the list.
boolean	Contains(java.lang.Object obj)
List	Copy()
java.lang.String	Dump()
java.util.Enumeration	Elements()
java.util.Vector	GetContents()
static void	main(java.lang.String[] args)
java.lang.Object	Peek() Returns element at the tail (if present), but does not remove it from list.
java.lang.Object	PeekAtHead() Returns element at the head (if present), but does not remove it from list.
void	readExternal(java.io.ObjectInput in)
java.lang.Object	Remove() Removes an object from the tail of the list.
void	RemoveAll()
java.lang.Object	RemoveElement(java.lang.Object obj) Removes element obj from the list, checking for equality using the equals operator.
java.lang.Object	RemoveFromHead() Removes an object from the head of the list.
int	Size()
java.lang.String	toString()
void	writeExternal(java.io.ObjectOutput out)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

List

public List()

Method Detail

Add

public void Add(java.lang.Object obj)

Adds an object at the tail of the list.

AddAtHead

public void AddAtHead(java.lang.Object obj)

Adds an object at the head of the list.

Remove

public java.lang.Object Remove()

Removes an object from the tail of the list. Returns null if no elements available

RemoveFromHead

public java.lang.Object RemoveFromHead()

Removes an object from the head of the list. Returns null if no elements available

Peek

public java.lang.Object Peek()

Returns element at the tail (if present), but does not remove it from list.

PeekAtHead

public java.lang.Object PeekAtHead()

Returns element at the head (if present), but does not remove it from list.

RemoveElement

public java.lang.Object RemoveElement(java.lang.Object obj)

Removes element obj from the list, checking for equality using the equals operator. Only the first duplicate object is removed. Returns the removed object.

RemoveAll

public void RemoveAll()

Size

public int Size()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

Dump

public java.lang.String Dump()

GetContents

public java.util.Vector GetContents()

Elements

public java.util.Enumeration Elements()

Contains

public boolean Contains(java.lang.Object obj)

Copy

public List Copy()

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Specified by:

writeExternal in interface java.io.Externalizable

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

main

public static void main(java.lang.String[] args)